Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
nhan luc » nang luc
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
luc ban » duc ban, cuc ban, luc bat
va nhan » van nhan, ca nhan, va phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ky nang) or (ty hang)) xa hoi. hieu va nhan luc ban hanh vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky nang) OR (ty hang)) xa hoi. hieu va nhan luc ban hanh vi ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky nang) or (ty hang)) xa hoi. hieu va nhan luc ban hanh vi ((va triet) or (su triet))*.